<template>
  <div>
    <!--面包屑导航区域-->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>权限管理</el-breadcrumb-item>
      <el-breadcrumb-item>角色列表</el-breadcrumb-item>
    </el-breadcrumb>
    <!--卡片视图区-->
    <el-card>
      <!--添加角色按钮区域-->
      <el-row>
        <el-col>
          <el-button type="primary">添加角色</el-button>
        </el-col>
      </el-row>
      <!--角色列表-->
      <el-table :data="rolesList">
        <!--展开列-->
        <el-table-column type="expand">
          <template slot-scope="scope">
            <el-row :class="['vcenter','bdbottom',i1 === 0? 'bdtop' : '']" v-for="(item1, i1) in scope.row.children" :key="item1.id">
              <!--渲染一级权限-->
              <el-col :span="5">
                <el-tag closable @close="removeRightById(scope.row,item1.id)">{{ item1.authName }}</el-tag>
                <i class="el-icon-caret-right"></i>
              </el-col>
              <!--渲染二级和三级权限-->
              <el-col :span="19">
                <el-row :class="['vcenter',i2 === 0 ? '' : 'bdtop']" v-for="(item2, i2) in  item1.children" :key="item2.id">
                  <el-col :span="6">
                    <el-tag type="success" closable @close="removeRightById(scope.row,item2.id)">{{ item2.authName }}}</el-tag>
                    <i class="el-icon-caret-right"></i>
                  </el-col>
                  <el-col :span="18">
                    <el-tag v-for="item3 of item2.children"
                            :key="item3.id" type="warning" closable
                            @close="removeRightById(scope.row,item3.id)">
                      {{ item3.authName }}
                    </el-tag>
                  </el-col>

                </el-row>

              </el-col>
            </el-row>

          </template>
        </el-table-column>
        <!--索引列-->
        <el-table-column type="index"></el-table-column>
        <el-table-column label="角色名称" prop="roleName"></el-table-column>
        <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
        <el-table-column label="操作">
          <template slot-scope="scope">
            <el-button type="primary" icon="el-icon-edit" size="mini">编辑</el-button>
            <el-button type="danger" icon="el-icon-delete" size="mini">删除</el-button>
            <el-button @click="showSetRightDialog(scope.row)" type="warning" icon="el-icon-setting" size="mini">分配权限</el-button>
          </template>
        </el-table-column>
      </el-table>
    </el-card>
    <!--分配权限的对话框-->
    <el-dialog title="分配权限" :visible.sync="setRightDialogVisible"
               width="50%" @close="setRightDialogClosed">
      <!--树形控件-->
      <el-tree :data="rightsList" :props="treeProps" node-key="id" :default-checked-keys="defKeys"
               ref="treeRef" show-checkbox default-expand-all></el-tree>
      <span slot="footer" class="dialog-footer">
        <el-button @click="setRightDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="allotRights">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  name: "Roles",
  data() {
    return {
      //角色列表
      rolesList: [],
      //控制分配权限对话框的显示/隐藏
      setRightDialogVisible: false,
      //所有权限的数据
      rightsList: [],
      //树形控件的属性绑定对象
      treeProps: {
        label: 'authName', //节点名称
        children:'children' //实现父子节点嵌套
      },
      //默认选中的节点Id值数组
      defKeys: [],
      //当前即将分配权限的角色id
      roleId: '',
    }
  },
  created() {
    this.getRolesList();
  },
  methods: {
    async getRolesList() {
      const { data : res } = await this.$http.get('roles');
      if(res.meta.status !== 200) return this.$message.error('获取角色列表失败');
      this.rolesList = res.data;
      // console.log(res);
    },
    //根据ID删除对应的权限
    async removeRightById(role,rightId) {
      //弹框提示用户是否确定删除权限
      const confirmResult = await this.$confirm('此操作将永久删除该权限, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(error => error)
      if(confirmResult === 'cancel') return this.$message.info('已取消删除');
      //发起删除的网络请求
      const { data : res } = await this.$http.delete(`roles/${role.id}/rights/${rightId}`);
      if(res.meta.status !== 200) return this.$message.error('删除权限失败');
      this.$message.success('删除权限成功');
      // //重新获取权限列表
      // this.getRolesList();
      role.children = res.data;
    },
    //展示分配权限的对话框
    async showSetRightDialog(role) {
      this.roleId = role.id;
      //获取所有权限的数据
      const { data : res } = await this.$http.get('rights/tree');
      if(res.meta.status !== 200) return this.$message.error('获取权限数据失败');
      //获取到的权限数据保存到rightsList中
      this.rightsList = res.data;
      // console.log(this.rightsList);
      //递归获取三级节点的id
      this.getLeafKeys(role,this.defKeys); //递归调用成功后，defKeys中保存的是三级权限的id
      // 显示分配权限对话框
      this.setRightDialogVisible = true;
    },
    //通过递归的形式，获取角色下所有三级权限的id，并保存到defKeys数组中
    getLeafKeys(node, arr) {
      //如果当前节点node不包含children属性，则证明是三级节点
      if(!node.children) {
        return arr.push(node.id);
      }
      node.children.forEach(item => this.getLeafKeys(item,arr))
    },
    //监听分配权限对话框的关闭事件
    setRightDialogClosed() {
      this.defKeys = [];
    },
    // 点击为角色分配权限
    async allotRights() {
      const keys = [
          ...this.$refs.treeRef.getCheckedKeys(),
          ...this.$refs.treeRef.getHalfCheckedKeys()
      ];
      const idStr = keys.join(','); //以,拼接的字符串
      const { data : res } = await this.$http.post(`roles/${this.roleId}/rights`,{ rids : idStr});
      if(res.meta.status !== 200) return this.$message.error('分配权限失败');
      this.$message.success('分配权限成功');
      this.getRolesList(); //刷新数据列表
      this.setRightDialogVisible = false; //隐藏对话框
    }
  }
}
</script>

<style scoped>
  .el-tag {
    margin: 7px;
  }
  .bdtop {
    border-top: 1px solid #eee;

  }
  .bdbottom {
    border-bottom: 1px solid #eee;
  }
  .vcenter { /*纵向居中对齐*/
    display: flex;
    align-items: center;
  }
</style>
